Preparation method of high-precision small-diameter thin-wall flaring bendable aluminum alloy pipe

Abstract

The invention relates to a preparation method of a high-precision small-diameter thin-wall flaring bendable aluminum alloy pipe, and belongs to the technical field of metal machining. The method comprises the following steps that (1), an aluminum alloy extruded pipe blank is cut out with a certain length; (2), one-pass two-roller rolling cogging is carried out on the pipe blank obtained in the step (1); (3), stress relief annealing is carried out on the pipe blank obtained in the step (2) to eliminate work hardening; (4), the pipe blank obtained in the step (3) is subjected to three-spinning-wheel powerful spinning deformation, and spinning residues are cut off; (5), small-deformation empty drawing diameter reduction is carried out on the pipe blank obtained in the step (4); and (6), heattreatment s carried out on the pipe obtained in the step (5) to obtain a finished pipe. According to the preparation method, the axial and circumferential structures of the finished product pipe are refined, the mechanical property is excellent, and the excellent flaring bending forming property of the finished product is guaranteed; and two-roller large-rolling-reduction reducing cogging is adopted, sufficient blank deformation and grain refinement are guaranteed, and meanwhile, the machining efficiency of the pipe is improved; and the pipe prepared through the method is more economical.

Description

technical field [0001] The invention relates to a preparation method of a high-precision small-diameter thin-walled flarable bendable aluminum alloy pipe, which belongs to the technical field of metal processing. [0002] technical background [0003] Small-diameter thin-walled aluminum alloy pipes are mainly used in aircraft environmental control, hydraulic, fuel and other systems. Small-diameter thin-walled aluminum alloy pipes are usually produced by perforated extrusion + multi-pass drawing. Due to the small amount of thinning in the drawing pass, multiple annealing is required during the drawing process, and the grains are difficult to break during the forming process. , The finished pipe has a thick structure, and is prone to defects such as wrinkles after bending and flaring. The airtightness of the system is low, and even serious accidents such as breakdown and leakage occur. Contents of the invention [0004] The purpose of the present invention is mainly to solve...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is mainly to solve the problems of the current aviation small-diameter aluminum alloy finished pipes, which have coarse grains and are prone to wrinkles and cracks in the subsequent bending and flaring process, and provide a high-precision small-diameter pipe with fine structure and excellent formability. Pipe preparation and processing method